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- Title
Knowledge-based iterative model reconstruction: comparative image quality and radiation dose with a pediatric computed tomography phantom.
- Authors
Ryu, Young; Choi, Young; Cheon, Jung-Eun; Ha, Seongmin; Kim, Woo; Kim, In-One; Ryu, Young Jin; Choi, Young Hun; Kim, Woo Sun
- Abstract
<bold>Background: </bold>CT of pediatric phantoms can provide useful guidance to the optimization of knowledge-based iterative reconstruction CT.<bold>Objective: </bold>To compare radiation dose and image quality of CT images obtained at different radiation doses reconstructed with knowledge-based iterative reconstruction, hybrid iterative reconstruction and filtered back-projection.<bold>Materials and Methods: </bold>We scanned a 5-year anthropomorphic phantom at seven levels of radiation. We then reconstructed CT data with knowledge-based iterative reconstruction (iterative model reconstruction [IMR] levels 1, 2 and 3; Philips Healthcare, Andover, MA), hybrid iterative reconstruction (iDose(4), levels 3 and 7; Philips Healthcare, Andover, MA) and filtered back-projection. The noise, signal-to-noise ratio and contrast-to-noise ratio were calculated. We evaluated low-contrast resolutions and detectability by low-contrast targets and subjective and objective spatial resolutions by the line pairs and wire.<bold>Results: </bold>With radiation at 100 peak kVp and 100 mAs (3.64 mSv), the relative doses ranged from 5% (0.19 mSv) to 150% (5.46 mSv). Lower noise and higher signal-to-noise, contrast-to-noise and objective spatial resolution were generally achieved in ascending order of filtered back-projection, iDose(4) levels 3 and 7, and IMR levels 1, 2 and 3, at all radiation dose levels. Compared with filtered back-projection at 100% dose, similar noise levels were obtained on IMR level 2 images at 24% dose and iDose(4) level 3 images at 50% dose, respectively. Regarding low-contrast resolution, low-contrast detectability and objective spatial resolution, IMR level 2 images at 24% dose showed comparable image quality with filtered back-projection at 100% dose. Subjective spatial resolution was not greatly affected by reconstruction algorithm.<bold>Conclusion: </bold>Reduced-dose IMR obtained at 0.92 mSv (24%) showed similar image quality to routine-dose filtered back-projection obtained at 3.64 mSv (100%), and half-dose iDose(4) obtained at 1.81 mSv.
- Subjects
IMAGING phantoms; COMPUTED tomography; IMAGE quality in radiography; PEDIATRICS; IMAGE quality in imaging systems; COMPARATIVE studies; COMPUTER simulation; DIAGNOSTIC imaging; DIGITAL diagnostic imaging; HEALTH; RESEARCH methodology; MEDICAL cooperation; RADIATION; RADIATION doses; RESEARCH; RESEARCH evaluation; EVALUATION research; KNOWLEDGE base; STATISTICAL models; EQUIPMENT &; supplies
- Publication
Pediatric Radiology, 2016, Vol 46, Issue 3, p303
- ISSN
0301-0449
- Publication type
journal article
- DOI
10.1007/s00247-015-3486-6